Tie brace for concrete forms



.Jhn 123923. 1,458,769

R. A. M HALE I TIE BRACE FOR CONCRETE FORMS Filed Feb. 4 1921 VA TTORNEYS.

Patented June 12, 1.923.

entree. res;

RAY A. MCHALE, or SYRACUSE, NEW YORK, ASSIGNOR 'ro LOIS 'I'. iirermnn, or

' SYRACUSE, new YORK.

v TIE BBACE FOR Application filed February 4,

To all whom it may concern:

Be it known that I, RAY A. MoHALn, a citizen of the United States, anda resident of Syracuse, in the county of Onondaga and State of New York, have invented a certain new and useful .Tie Brace for Concrete Forms, of which the following is a specification.

This invention has for its object a tie brace for holding the opposing walls of concrete forms in position or in parallelism to each other which tie brace is particularly simple and economical in construction, readily placed'in position and in which all the parts thereof are readily removed from the wall so that none of the parts are left in the concrete wall. g

The invention consists in the novel features and in the combinations and constructions hereinafter set forth and claimed.

In describing this invention. reference is had to the accompanying drawings in which like characters. designate corresponding parts in all the'views; v I

Figure 1 is an elevation, part-1y in section of this tie brace. the contiguous part or walls of the former being shown in section.

Figure 2 is a plan view of parts seen in Fig.

Figure 3 is an enlarged fragmentary sectional View of one of the blocks, the contiguous portions of the tie rod and pull rod being also shown.

Figure 4 is an elevation looking to the right in Fig. 8.

This tie brace comprises generally. opposing blocks or sleeves designed to lie against the opposing faces of the walls of the form a tie rod connecting the blocks, tension members having detachable connectionwith the blocks and extending through the walls of the form, and means for applying tension to said members.

1 designates the blocks ;'2 the tie rodwhich threads into the opposing ends of the blocks as at 3.

Each of the blocks is also formed with aninternal cavity 5 having an entrance opening in the form of a keyslot (3 through the outer end of the block.

7 designates tension members which are preferably, pull rods, each of which is formed with a hook-shaped end 8 arranged to interlock in the cavity through the key slot by a relative endwise and turning move- CONCRE'IE FORMS.

1921. Seria1 N0.442,421. ment of the rod and the block. Each rod 7 and block 5 are provided with means for holding the pull rod fromlateral displace.- inent relatively to the block when the hook is interlocked in the cavity and out of alinement with the slot 6, that is, with means for preventing the rod moving radially. in the slot especially when the slot 6 extends downwardly.

.As here illustrated, the inner face of the end wall 9 of the block 5 is formed conical or undercut as at 10 and the hook 8 is provided with a-bevel surface 11 complemental to the conical surfacelO. Hence, after the rod has been passed endwise to carry the hook 8 through the slot 6 and turned, the bevel face 11 of the hookhugs the conical or undercut face 10 and thus holds the rod froni displacement until the rod is tightened.

Also, when the pull rod is being tightened these surfacesact inclined plane fashion on each other. Preferably, a shoulder 10 is provided in the cavity of the block in position to limit the'turning of the rod 7 when the hook 8 is diametrically opposite the slots 6. Also. as a precaution "against the rod displacing laterally in the slot 6 before it is tightened in case the depth of the cavity of the block is enough greater than the thickness of the hook 8 from front to rear thereof the slot 6 is contracted near its inner end by inwardly projecting shoulders 6 which extend part way around the rod 7 when the hook 8 has been passed through the slot, and the hook 8 is provided with grooves 8 to clear such shoulders.

The end face of each block is, also cupped out as at 12 so that the block engages the inner face of the form 13 at its edge 14 only and thus obtains an even bearing on the form 13. Also, the block may be provided on such end face with a lip 12 for entering the hole 12 in the form.

In operation, the blocks 1 are threaded on the ends of the rodv2 and thereafter the pull rods inserted through suitable openings in the beam 7 and wall 13 and interlocked with the blocks 4. The wedges 15 are then placed in position. v 1

After the concrete orcement is set' the forms are removed by displacing the wedges unlocking the rods 7 in the blocks 1 and removing them permitting the form 13 to be removed. One of the blocks 1 isthen unscrewed and the tie 'rod knocked out.

Owing to the fact that the blocks thread on the tie rod, the tie rod can be removed instead of, being left in the wall.

What I claim is:

1. In a tie brace for concrete forms the combination of a pair of blocks, a tie rod connecting the blocks, each block being formed with an internal cavity and with a radial slot in its end wall, the slot opening into the cavity, and tension rods arranged substantially in alinement with the tie rod, each tension rod having a hook at its inner end arranged to pass through the slot into the cavity and interlockwith the end wall thereof upon successive endwise and partial rotary movements of the tension rod, sub stantially as and for the purpose described.

2, In a tie brace for concrete forms, the combination of a pair of blocks, a tie rod to the ends of which the blocks are secured each block being formed with a cavity, and a key slot opening into the cavity through the outer end of the block,the wall of the cavity around the key slot being conoidal or beveled, and tension members arranged substantially in alinement' with the ends of the tie rod and having hooks at their ends, the hooks having backwardly inclined faces for conforming to the cone of the wall of the 'the outer end of the cavity, tension rods arranged substantially in alinement with the ends ofthe tie rod and each having a hook at its endarranged to interlock in the cavity of the adjacent block through the key slots by relative endwise and rotary movements of the rod and the blocks, and means for holdin the rods from lateral displacement in the slot when the hook is interlocked in the cavity, substantially as and for the-purpose described.

4. In a tie brace for concrete forms, the combination of a pair of blocks, a tie rod connecting the blocks, each block being formed with a cavity and with a key slot at the outer end of the cavity, tension rods arranged substantially in alinement with the ends of the tie rod and each having a hook at its end arranged to'interlock in the cavity of the adjacent block through the key slot by relative endwise and rotary movements of the rod and the blocks, the slot being provided with shoulders on opposite sides thereof and the rod at the base of the hook being provided with grooves for receiving the shoulders, substantially as and for the purpose set forth.

In testimony whereof, I have hereunto signed my name, at Syracuse, in the county of Onondaga, and State of New York, this 28th, day of January, 1921.

RAY- A. MGHALE. 

